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Commit df65c1bc authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86/PCI: Select CONFIG_PCI_LOCKLESS_CONFIG 



All x86 PCI configuration space accessors have either their own
serialization or can operate completely lockless (ECAM).

Disable the global lock in the generic PCI configuration space accessors.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarBjorn Helgaas <helgaas@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: linux-pci@vger.kernel.org
Link: http://lkml.kernel.org/r/20170316215057.295079391@linutronix.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 714fe383

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -166,6 +166,7 @@ config X86 
	select HAVE_UNSTABLE_SCHED_CLOCK

	select HAVE_USER_RETURN_NOTIFIER

	select IRQ_FORCED_THREADING

	select PCI_LOCKLESS_CONFIG

	select PERF_EVENTS

	select RTC_LIB

	select RTC_MC146818_LIB

arch/x86/pci/common.c

+2 −2
Original line number Diff line number Diff line
@@ -75,8 +75,8 @@ struct pci_ops pci_root_ops = { 
};



/*

 * This interrupt-safe spinlock protects all accesses to PCI

 * configuration space.

 * This interrupt-safe spinlock protects all accesses to PCI configuration

 * space, except for the mmconfig (ECAM) based operations.

 */

DEFINE_RAW_SPINLOCK(pci_config_lock);